Just out of La Celle-St-Cloud, Paris the 'cottages' were on a small island & had thatched roofs & the buildings & gardens were very well kept.

There are apps but a spiral paper notebook is fine.

Box; rent can only be paid by bank deposit.For your convenience, the nearest location to your home is 123 Main Street, (City), or you can execute a bank-to-bank transfer using the routing number provided.If you have any questions, concerns or maintenance issues, you may call or text my cell phone at (your business number), or you may email me at the address listed at the top of this notice.Please don’t hesitate to contact me with any questions about this transition or any other pertinent issue.Sincerely,(you)

My apprehension is that after the initial furnishing, app process, move in, there isn't much to do.

All I would need to do is clear out the basement and post it on the app.

additionally sometimes the listings are just garbage, cell phone pics, or no pics, and limited info will easily make a listing sit. 

@Zach Edelman dealcheck app.

This has been a side thing for us, and our accounting has been old school manual spreadsheets, along with rent collection varying from tenant to tenant (Zelle, PayPal, cash app, etc…) neither of us are great at keeping up with accounting which makes tax time a nightmare.

I am not aware of an APP or system that I can confirm, only an HRA general number that has been provided.

These apps make tracking the financing so much easier, plus they handle online rent collection (a necessity if you don't have a property manager!)